tomcat down掉SEVERE: All threads (150) are currently busy问题

Jul 15, 2015 9:11:02 AM org.apache.tomcat.util.threads.ThreadPool logFull
SEVERE: All threads (150) are currently busy, waiting. Increase maxThreads (150) or check the servlet status
测试使用几天就挂掉了，网上都说是DataSource的问题，贴上我Spring DataSource的配置，实在看不出问题所在，求指点。

<?xml version="1.0" encoding="UTF-8"?>
<datasources>
    <datasource name="dap" type="JDBC">
        <minEvictableIdleTimeMillis>30000</minEvictableIdleTimeMillis>
        <timeBetweenEvictionRunsMillis>30000</timeBetweenEvictionRunsMillis>
        <driver>net.sourceforge.jtds.jdbc.Driver</driver>
        <url>jdbc:jtds:sqlserver://ip:1433/dataBasename</url>
        <dialect>dframe.data.db.dialect.MSSQL_JTDS_Dialect</dialect>
        <user>sa</user>
        <password>abc123456</password>
        <minIdle>0</minIdle>
        <maxIdle>0</maxIdle>
        <maxActive>0</maxActive>
        <loginTimeout>0</loginTimeout>
        <maxWait>10000</maxWait>
    </datasource>
</datasources>